614 lines
16 KiB
C
614 lines
16 KiB
C
/*
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* Marvell Armada 370 and Armada XP SoC IRQ handling
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*
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* Copyright (C) 2012 Marvell
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*
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* Lior Amsalem <alior@marvell.com>
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* Gregory CLEMENT <gregory.clement@free-electrons.com>
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* Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
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* Ben Dooks <ben.dooks@codethink.co.uk>
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/irq.h>
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#include <linux/interrupt.h>
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#include <linux/irqchip.h>
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#include <linux/irqchip/chained_irq.h>
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#include <linux/cpu.h>
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#include <linux/io.h>
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#include <linux/of_address.h>
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#include <linux/of_irq.h>
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#include <linux/of_pci.h>
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#include <linux/irqdomain.h>
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#include <linux/slab.h>
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#include <linux/syscore_ops.h>
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#include <linux/msi.h>
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#include <asm/mach/arch.h>
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#include <asm/exception.h>
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#include <asm/smp_plat.h>
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#include <asm/mach/irq.h>
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/* Interrupt Controller Registers Map */
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#define ARMADA_370_XP_INT_SET_MASK_OFFS (0x48)
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#define ARMADA_370_XP_INT_CLEAR_MASK_OFFS (0x4C)
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#define ARMADA_370_XP_INT_FABRIC_MASK_OFFS (0x54)
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#define ARMADA_370_XP_INT_CAUSE_PERF(cpu) (1 << cpu)
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#define ARMADA_370_XP_INT_CONTROL (0x00)
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#define ARMADA_370_XP_INT_SET_ENABLE_OFFS (0x30)
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#define ARMADA_370_XP_INT_CLEAR_ENABLE_OFFS (0x34)
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#define ARMADA_370_XP_INT_SOURCE_CTL(irq) (0x100 + irq*4)
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#define ARMADA_370_XP_INT_SOURCE_CPU_MASK 0xF
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#define ARMADA_370_XP_INT_IRQ_FIQ_MASK(cpuid) ((BIT(0) | BIT(8)) << cpuid)
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#define ARMADA_370_XP_CPU_INTACK_OFFS (0x44)
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#define ARMADA_375_PPI_CAUSE (0x10)
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#define ARMADA_370_XP_SW_TRIG_INT_OFFS (0x4)
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#define ARMADA_370_XP_IN_DRBEL_MSK_OFFS (0xc)
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#define ARMADA_370_XP_IN_DRBEL_CAUSE_OFFS (0x8)
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#define ARMADA_370_XP_MAX_PER_CPU_IRQS (28)
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#define IPI_DOORBELL_START (0)
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#define IPI_DOORBELL_END (8)
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#define IPI_DOORBELL_MASK 0xFF
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#define PCI_MSI_DOORBELL_START (16)
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#define PCI_MSI_DOORBELL_NR (16)
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#define PCI_MSI_DOORBELL_END (32)
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#define PCI_MSI_DOORBELL_MASK 0xFFFF0000
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static void __iomem *per_cpu_int_base;
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static void __iomem *main_int_base;
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static struct irq_domain *armada_370_xp_mpic_domain;
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static u32 doorbell_mask_reg;
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static int parent_irq;
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#ifdef CONFIG_PCI_MSI
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static struct irq_domain *armada_370_xp_msi_domain;
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static struct irq_domain *armada_370_xp_msi_inner_domain;
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static DECLARE_BITMAP(msi_used, PCI_MSI_DOORBELL_NR);
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static DEFINE_MUTEX(msi_used_lock);
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static phys_addr_t msi_doorbell_addr;
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#endif
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static inline bool is_percpu_irq(irq_hw_number_t irq)
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{
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if (irq <= ARMADA_370_XP_MAX_PER_CPU_IRQS)
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return true;
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return false;
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}
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/*
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* In SMP mode:
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* For shared global interrupts, mask/unmask global enable bit
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* For CPU interrupts, mask/unmask the calling CPU's bit
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*/
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static void armada_370_xp_irq_mask(struct irq_data *d)
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{
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irq_hw_number_t hwirq = irqd_to_hwirq(d);
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if (!is_percpu_irq(hwirq))
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writel(hwirq, main_int_base +
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ARMADA_370_XP_INT_CLEAR_ENABLE_OFFS);
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else
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writel(hwirq, per_cpu_int_base +
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ARMADA_370_XP_INT_SET_MASK_OFFS);
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}
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static void armada_370_xp_irq_unmask(struct irq_data *d)
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{
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irq_hw_number_t hwirq = irqd_to_hwirq(d);
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if (!is_percpu_irq(hwirq))
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writel(hwirq, main_int_base +
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ARMADA_370_XP_INT_SET_ENABLE_OFFS);
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else
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writel(hwirq, per_cpu_int_base +
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ARMADA_370_XP_INT_CLEAR_MASK_OFFS);
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}
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#ifdef CONFIG_PCI_MSI
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static struct irq_chip armada_370_xp_msi_irq_chip = {
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.name = "MPIC MSI",
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.irq_mask = pci_msi_mask_irq,
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.irq_unmask = pci_msi_unmask_irq,
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};
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static struct msi_domain_info armada_370_xp_msi_domain_info = {
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.flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
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MSI_FLAG_MULTI_PCI_MSI),
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.chip = &armada_370_xp_msi_irq_chip,
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};
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static void armada_370_xp_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
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{
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msg->address_lo = lower_32_bits(msi_doorbell_addr);
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msg->address_hi = upper_32_bits(msi_doorbell_addr);
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msg->data = 0xf00 | (data->hwirq + PCI_MSI_DOORBELL_START);
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}
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static int armada_370_xp_msi_set_affinity(struct irq_data *irq_data,
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const struct cpumask *mask, bool force)
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{
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return -EINVAL;
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}
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static struct irq_chip armada_370_xp_msi_bottom_irq_chip = {
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.name = "MPIC MSI",
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.irq_compose_msi_msg = armada_370_xp_compose_msi_msg,
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.irq_set_affinity = armada_370_xp_msi_set_affinity,
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};
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static int armada_370_xp_msi_alloc(struct irq_domain *domain, unsigned int virq,
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unsigned int nr_irqs, void *args)
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{
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int hwirq, i;
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mutex_lock(&msi_used_lock);
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hwirq = bitmap_find_next_zero_area(msi_used, PCI_MSI_DOORBELL_NR,
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0, nr_irqs, 0);
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if (hwirq >= PCI_MSI_DOORBELL_NR) {
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mutex_unlock(&msi_used_lock);
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return -ENOSPC;
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}
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bitmap_set(msi_used, hwirq, nr_irqs);
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mutex_unlock(&msi_used_lock);
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for (i = 0; i < nr_irqs; i++) {
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irq_domain_set_info(domain, virq + i, hwirq + i,
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&armada_370_xp_msi_bottom_irq_chip,
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domain->host_data, handle_simple_irq,
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NULL, NULL);
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}
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return hwirq;
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}
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static void armada_370_xp_msi_free(struct irq_domain *domain,
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unsigned int virq, unsigned int nr_irqs)
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{
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struct irq_data *d = irq_domain_get_irq_data(domain, virq);
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mutex_lock(&msi_used_lock);
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bitmap_clear(msi_used, d->hwirq, nr_irqs);
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mutex_unlock(&msi_used_lock);
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}
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static const struct irq_domain_ops armada_370_xp_msi_domain_ops = {
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.alloc = armada_370_xp_msi_alloc,
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.free = armada_370_xp_msi_free,
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};
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static int armada_370_xp_msi_init(struct device_node *node,
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phys_addr_t main_int_phys_base)
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{
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u32 reg;
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msi_doorbell_addr = main_int_phys_base +
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ARMADA_370_XP_SW_TRIG_INT_OFFS;
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armada_370_xp_msi_inner_domain =
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irq_domain_add_linear(NULL, PCI_MSI_DOORBELL_NR,
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&armada_370_xp_msi_domain_ops, NULL);
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if (!armada_370_xp_msi_inner_domain)
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return -ENOMEM;
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armada_370_xp_msi_domain =
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pci_msi_create_irq_domain(of_node_to_fwnode(node),
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&armada_370_xp_msi_domain_info,
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armada_370_xp_msi_inner_domain);
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if (!armada_370_xp_msi_domain) {
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irq_domain_remove(armada_370_xp_msi_inner_domain);
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return -ENOMEM;
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}
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reg = readl(per_cpu_int_base + ARMADA_370_XP_IN_DRBEL_MSK_OFFS)
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| PCI_MSI_DOORBELL_MASK;
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writel(reg, per_cpu_int_base +
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ARMADA_370_XP_IN_DRBEL_MSK_OFFS);
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/* Unmask IPI interrupt */
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writel(1, per_cpu_int_base + ARMADA_370_XP_INT_CLEAR_MASK_OFFS);
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return 0;
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}
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#else
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static inline int armada_370_xp_msi_init(struct device_node *node,
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phys_addr_t main_int_phys_base)
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{
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return 0;
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}
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#endif
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#ifdef CONFIG_SMP
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static DEFINE_RAW_SPINLOCK(irq_controller_lock);
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static int armada_xp_set_affinity(struct irq_data *d,
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const struct cpumask *mask_val, bool force)
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{
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irq_hw_number_t hwirq = irqd_to_hwirq(d);
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unsigned long reg, mask;
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int cpu;
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/* Select a single core from the affinity mask which is online */
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cpu = cpumask_any_and(mask_val, cpu_online_mask);
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mask = 1UL << cpu_logical_map(cpu);
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raw_spin_lock(&irq_controller_lock);
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reg = readl(main_int_base + ARMADA_370_XP_INT_SOURCE_CTL(hwirq));
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reg = (reg & (~ARMADA_370_XP_INT_SOURCE_CPU_MASK)) | mask;
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writel(reg, main_int_base + ARMADA_370_XP_INT_SOURCE_CTL(hwirq));
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raw_spin_unlock(&irq_controller_lock);
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return IRQ_SET_MASK_OK;
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}
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#endif
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static struct irq_chip armada_370_xp_irq_chip = {
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.name = "MPIC",
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.irq_mask = armada_370_xp_irq_mask,
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.irq_mask_ack = armada_370_xp_irq_mask,
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.irq_unmask = armada_370_xp_irq_unmask,
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#ifdef CONFIG_SMP
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.irq_set_affinity = armada_xp_set_affinity,
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#endif
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.flags = IRQCHIP_SKIP_SET_WAKE | IRQCHIP_MASK_ON_SUSPEND,
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};
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static int armada_370_xp_mpic_irq_map(struct irq_domain *h,
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unsigned int virq, irq_hw_number_t hw)
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{
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armada_370_xp_irq_mask(irq_get_irq_data(virq));
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if (!is_percpu_irq(hw))
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writel(hw, per_cpu_int_base +
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ARMADA_370_XP_INT_CLEAR_MASK_OFFS);
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else
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writel(hw, main_int_base + ARMADA_370_XP_INT_SET_ENABLE_OFFS);
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irq_set_status_flags(virq, IRQ_LEVEL);
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if (is_percpu_irq(hw)) {
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irq_set_percpu_devid(virq);
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irq_set_chip_and_handler(virq, &armada_370_xp_irq_chip,
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handle_percpu_devid_irq);
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} else {
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irq_set_chip_and_handler(virq, &armada_370_xp_irq_chip,
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handle_level_irq);
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}
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irq_set_probe(virq);
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irq_clear_status_flags(virq, IRQ_NOAUTOEN);
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return 0;
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}
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static void armada_xp_mpic_smp_cpu_init(void)
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{
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u32 control;
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int nr_irqs, i;
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control = readl(main_int_base + ARMADA_370_XP_INT_CONTROL);
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nr_irqs = (control >> 2) & 0x3ff;
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for (i = 0; i < nr_irqs; i++)
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writel(i, per_cpu_int_base + ARMADA_370_XP_INT_SET_MASK_OFFS);
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/* Clear pending IPIs */
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writel(0, per_cpu_int_base + ARMADA_370_XP_IN_DRBEL_CAUSE_OFFS);
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/* Enable first 8 IPIs */
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writel(IPI_DOORBELL_MASK, per_cpu_int_base +
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ARMADA_370_XP_IN_DRBEL_MSK_OFFS);
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/* Unmask IPI interrupt */
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writel(0, per_cpu_int_base + ARMADA_370_XP_INT_CLEAR_MASK_OFFS);
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}
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static void armada_xp_mpic_perf_init(void)
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{
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unsigned long cpuid = cpu_logical_map(smp_processor_id());
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/* Enable Performance Counter Overflow interrupts */
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writel(ARMADA_370_XP_INT_CAUSE_PERF(cpuid),
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per_cpu_int_base + ARMADA_370_XP_INT_FABRIC_MASK_OFFS);
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}
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#ifdef CONFIG_SMP
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static void armada_mpic_send_doorbell(const struct cpumask *mask,
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unsigned int irq)
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{
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int cpu;
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unsigned long map = 0;
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/* Convert our logical CPU mask into a physical one. */
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for_each_cpu(cpu, mask)
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map |= 1 << cpu_logical_map(cpu);
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/*
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* Ensure that stores to Normal memory are visible to the
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* other CPUs before issuing the IPI.
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*/
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dsb();
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/* submit softirq */
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writel((map << 8) | irq, main_int_base +
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ARMADA_370_XP_SW_TRIG_INT_OFFS);
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}
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static int armada_xp_mpic_secondary_init(struct notifier_block *nfb,
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unsigned long action, void *hcpu)
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{
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if (action == CPU_STARTING || action == CPU_STARTING_FROZEN) {
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armada_xp_mpic_perf_init();
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armada_xp_mpic_smp_cpu_init();
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}
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return NOTIFY_OK;
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}
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static struct notifier_block armada_370_xp_mpic_cpu_notifier = {
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.notifier_call = armada_xp_mpic_secondary_init,
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.priority = 100,
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};
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static int mpic_cascaded_secondary_init(struct notifier_block *nfb,
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unsigned long action, void *hcpu)
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{
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if (action == CPU_STARTING || action == CPU_STARTING_FROZEN) {
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armada_xp_mpic_perf_init();
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enable_percpu_irq(parent_irq, IRQ_TYPE_NONE);
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}
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return NOTIFY_OK;
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}
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static struct notifier_block mpic_cascaded_cpu_notifier = {
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.notifier_call = mpic_cascaded_secondary_init,
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.priority = 100,
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};
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#endif /* CONFIG_SMP */
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static const struct irq_domain_ops armada_370_xp_mpic_irq_ops = {
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.map = armada_370_xp_mpic_irq_map,
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.xlate = irq_domain_xlate_onecell,
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};
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#ifdef CONFIG_PCI_MSI
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static void armada_370_xp_handle_msi_irq(struct pt_regs *regs, bool is_chained)
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{
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u32 msimask, msinr;
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msimask = readl_relaxed(per_cpu_int_base +
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ARMADA_370_XP_IN_DRBEL_CAUSE_OFFS)
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& PCI_MSI_DOORBELL_MASK;
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writel(~msimask, per_cpu_int_base +
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ARMADA_370_XP_IN_DRBEL_CAUSE_OFFS);
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for (msinr = PCI_MSI_DOORBELL_START;
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msinr < PCI_MSI_DOORBELL_END; msinr++) {
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int irq;
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if (!(msimask & BIT(msinr)))
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continue;
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if (is_chained) {
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irq = irq_find_mapping(armada_370_xp_msi_inner_domain,
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msinr - PCI_MSI_DOORBELL_START);
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generic_handle_irq(irq);
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} else {
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irq = msinr - PCI_MSI_DOORBELL_START;
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handle_domain_irq(armada_370_xp_msi_inner_domain,
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irq, regs);
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}
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}
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}
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#else
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static void armada_370_xp_handle_msi_irq(struct pt_regs *r, bool b) {}
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#endif
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static void armada_370_xp_mpic_handle_cascade_irq(struct irq_desc *desc)
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{
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struct irq_chip *chip = irq_desc_get_chip(desc);
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unsigned long irqmap, irqn, irqsrc, cpuid;
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unsigned int cascade_irq;
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chained_irq_enter(chip, desc);
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irqmap = readl_relaxed(per_cpu_int_base + ARMADA_375_PPI_CAUSE);
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cpuid = cpu_logical_map(smp_processor_id());
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for_each_set_bit(irqn, &irqmap, BITS_PER_LONG) {
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irqsrc = readl_relaxed(main_int_base +
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ARMADA_370_XP_INT_SOURCE_CTL(irqn));
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/* Check if the interrupt is not masked on current CPU.
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* Test IRQ (0-1) and FIQ (8-9) mask bits.
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*/
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if (!(irqsrc & ARMADA_370_XP_INT_IRQ_FIQ_MASK(cpuid)))
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continue;
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if (irqn == 1) {
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armada_370_xp_handle_msi_irq(NULL, true);
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continue;
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}
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cascade_irq = irq_find_mapping(armada_370_xp_mpic_domain, irqn);
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generic_handle_irq(cascade_irq);
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}
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chained_irq_exit(chip, desc);
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}
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static void __exception_irq_entry
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armada_370_xp_handle_irq(struct pt_regs *regs)
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{
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u32 irqstat, irqnr;
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do {
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irqstat = readl_relaxed(per_cpu_int_base +
|
|
ARMADA_370_XP_CPU_INTACK_OFFS);
|
|
irqnr = irqstat & 0x3FF;
|
|
|
|
if (irqnr > 1022)
|
|
break;
|
|
|
|
if (irqnr > 1) {
|
|
handle_domain_irq(armada_370_xp_mpic_domain,
|
|
irqnr, regs);
|
|
continue;
|
|
}
|
|
|
|
/* MSI handling */
|
|
if (irqnr == 1)
|
|
armada_370_xp_handle_msi_irq(regs, false);
|
|
|
|
#ifdef CONFIG_SMP
|
|
/* IPI Handling */
|
|
if (irqnr == 0) {
|
|
u32 ipimask, ipinr;
|
|
|
|
ipimask = readl_relaxed(per_cpu_int_base +
|
|
ARMADA_370_XP_IN_DRBEL_CAUSE_OFFS)
|
|
& IPI_DOORBELL_MASK;
|
|
|
|
writel(~ipimask, per_cpu_int_base +
|
|
ARMADA_370_XP_IN_DRBEL_CAUSE_OFFS);
|
|
|
|
/* Handle all pending doorbells */
|
|
for (ipinr = IPI_DOORBELL_START;
|
|
ipinr < IPI_DOORBELL_END; ipinr++) {
|
|
if (ipimask & (0x1 << ipinr))
|
|
handle_IPI(ipinr, regs);
|
|
}
|
|
continue;
|
|
}
|
|
#endif
|
|
|
|
} while (1);
|
|
}
|
|
|
|
static int armada_370_xp_mpic_suspend(void)
|
|
{
|
|
doorbell_mask_reg = readl(per_cpu_int_base +
|
|
ARMADA_370_XP_IN_DRBEL_MSK_OFFS);
|
|
return 0;
|
|
}
|
|
|
|
static void armada_370_xp_mpic_resume(void)
|
|
{
|
|
int nirqs;
|
|
irq_hw_number_t irq;
|
|
|
|
/* Re-enable interrupts */
|
|
nirqs = (readl(main_int_base + ARMADA_370_XP_INT_CONTROL) >> 2) & 0x3ff;
|
|
for (irq = 0; irq < nirqs; irq++) {
|
|
struct irq_data *data;
|
|
int virq;
|
|
|
|
virq = irq_linear_revmap(armada_370_xp_mpic_domain, irq);
|
|
if (virq == 0)
|
|
continue;
|
|
|
|
if (!is_percpu_irq(irq))
|
|
writel(irq, per_cpu_int_base +
|
|
ARMADA_370_XP_INT_CLEAR_MASK_OFFS);
|
|
else
|
|
writel(irq, main_int_base +
|
|
ARMADA_370_XP_INT_SET_ENABLE_OFFS);
|
|
|
|
data = irq_get_irq_data(virq);
|
|
if (!irqd_irq_disabled(data))
|
|
armada_370_xp_irq_unmask(data);
|
|
}
|
|
|
|
/* Reconfigure doorbells for IPIs and MSIs */
|
|
writel(doorbell_mask_reg,
|
|
per_cpu_int_base + ARMADA_370_XP_IN_DRBEL_MSK_OFFS);
|
|
if (doorbell_mask_reg & IPI_DOORBELL_MASK)
|
|
writel(0, per_cpu_int_base + ARMADA_370_XP_INT_CLEAR_MASK_OFFS);
|
|
if (doorbell_mask_reg & PCI_MSI_DOORBELL_MASK)
|
|
writel(1, per_cpu_int_base + ARMADA_370_XP_INT_CLEAR_MASK_OFFS);
|
|
}
|
|
|
|
struct syscore_ops armada_370_xp_mpic_syscore_ops = {
|
|
.suspend = armada_370_xp_mpic_suspend,
|
|
.resume = armada_370_xp_mpic_resume,
|
|
};
|
|
|
|
static int __init armada_370_xp_mpic_of_init(struct device_node *node,
|
|
struct device_node *parent)
|
|
{
|
|
struct resource main_int_res, per_cpu_int_res;
|
|
int nr_irqs, i;
|
|
u32 control;
|
|
|
|
BUG_ON(of_address_to_resource(node, 0, &main_int_res));
|
|
BUG_ON(of_address_to_resource(node, 1, &per_cpu_int_res));
|
|
|
|
BUG_ON(!request_mem_region(main_int_res.start,
|
|
resource_size(&main_int_res),
|
|
node->full_name));
|
|
BUG_ON(!request_mem_region(per_cpu_int_res.start,
|
|
resource_size(&per_cpu_int_res),
|
|
node->full_name));
|
|
|
|
main_int_base = ioremap(main_int_res.start,
|
|
resource_size(&main_int_res));
|
|
BUG_ON(!main_int_base);
|
|
|
|
per_cpu_int_base = ioremap(per_cpu_int_res.start,
|
|
resource_size(&per_cpu_int_res));
|
|
BUG_ON(!per_cpu_int_base);
|
|
|
|
control = readl(main_int_base + ARMADA_370_XP_INT_CONTROL);
|
|
nr_irqs = (control >> 2) & 0x3ff;
|
|
|
|
for (i = 0; i < nr_irqs; i++)
|
|
writel(i, main_int_base + ARMADA_370_XP_INT_CLEAR_ENABLE_OFFS);
|
|
|
|
armada_370_xp_mpic_domain =
|
|
irq_domain_add_linear(node, nr_irqs,
|
|
&armada_370_xp_mpic_irq_ops, NULL);
|
|
BUG_ON(!armada_370_xp_mpic_domain);
|
|
armada_370_xp_mpic_domain->bus_token = DOMAIN_BUS_WIRED;
|
|
|
|
/* Setup for the boot CPU */
|
|
armada_xp_mpic_perf_init();
|
|
armada_xp_mpic_smp_cpu_init();
|
|
|
|
armada_370_xp_msi_init(node, main_int_res.start);
|
|
|
|
parent_irq = irq_of_parse_and_map(node, 0);
|
|
if (parent_irq <= 0) {
|
|
irq_set_default_host(armada_370_xp_mpic_domain);
|
|
set_handle_irq(armada_370_xp_handle_irq);
|
|
#ifdef CONFIG_SMP
|
|
set_smp_cross_call(armada_mpic_send_doorbell);
|
|
register_cpu_notifier(&armada_370_xp_mpic_cpu_notifier);
|
|
#endif
|
|
} else {
|
|
#ifdef CONFIG_SMP
|
|
register_cpu_notifier(&mpic_cascaded_cpu_notifier);
|
|
#endif
|
|
irq_set_chained_handler(parent_irq,
|
|
armada_370_xp_mpic_handle_cascade_irq);
|
|
}
|
|
|
|
register_syscore_ops(&armada_370_xp_mpic_syscore_ops);
|
|
|
|
return 0;
|
|
}
|
|
|
|
IRQCHIP_DECLARE(armada_370_xp_mpic, "marvell,mpic", armada_370_xp_mpic_of_init);
|